It is the intent of this Subsection F to recognize that family situations do, from time to time, require young people to live with their grandparents or other relatives or friends over the age of 55 and to provide a reasonable manner of accommodating a temporary occupancy by such individuals where they may have no other practical or safe place to reside. The Planning Board may grant up to two extensions of up to an additional six months per extension upon application to the Board. The Planning Board, in considering an extension, shall consider the effect, if any, on the quiet enjoyment of neighbors, the impact on sewer and water in the community, and the efforts of the occupants over the age of 19 to pursue other, permanent housing for themselves or the individuals under age 19 during the extension being sought. In the event any provision of this subsection is adjudged illegal, unconstitutional, or unenforceable by any court of competent jurisdiction, the entire Subsection F shall be deemed to be stricken.